My GO START 20 NOT RECOGNISED BY COMPUTER

My GO START 20 NOT RECOGNISED BY COMPUTER

Have a Go Start 20 13months old - have downloaded MYDRIVE CONNECT but when I try to add device computer does not recognise device. Have rebooted computer, have reset device and still the system does not recognise TomTom . I bought the TomTom with free lifetime maps. When I check Control Panel Device Manager choosuing Network Device no options given for Tom Tom- is this a con so that you buy a new TomTom each year ?